No import during build

Summary

Just fixed the quotes, and added default value to revision.

Test Environment

• Run the pipelines?

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• All automated tests pass
• Reference related issues #177 (closed)
• Up-to-date CHANGELOG.md (or not necessary)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
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  • Intent of new code
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
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For further good practices have a look at our review guidelines.

setup.py

@@ -97,6 +97,7 @@ def get_version_info():
     FULLVERSION = VERSION
 
     # Magic which is only really needed in the pipelines. Therefore: a lot of dark pipeline magic.
+    GIT_REVISION = "Unknown"
     if os.path.exists('.git'):
         GIT_REVISION = git_version()
     elif os.path.exists('linkahead_pylib_commit'):
@@ -105,14 +106,12 @@ def get_version_info():
     elif os.path.exists('src/linkahead/version.py'):
         # must be a source distribution, use existing version file
         with open('src/linkahead/version.py') as fi:
+            rev_pattern = re.compile(r"^git_revision = '(?P<rev>.*)'$")
             for line in fi.readlines():
-                match = re.match(r"^git_revision = (?P<rev>.*)$", line)
-
+                match = rev_pattern.match(line)
                 if match is not None:
                     GIT_REVISION = match.group('rev')
-
-    else:
-        GIT_REVISION = "Unknown"
+                    break
 
     if not ISRELEASED:
         FULLVERSION += '.dev0+' + GIT_REVISION[:7]